package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.lang.annotation.Annotation;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered,GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//        获取请求、响应对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

//        判断是否为登录
        if (request.getURI().getPath().contains("/login")){
//            是登录就放行
            return chain.filter(exchange);
        }

//        从请求头中获取token
        String token = request.getHeaders().getFirst("token");

//        判断token是否存在
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
//        解析token
        int verifyToken = AppJwtUtil.verifyToken(AppJwtUtil.getClaimsBody(token));
//        如果值大于0，代表token已经过期
        if (verifyToken>0){
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
